Coupling means



H. RODER COUPLING MEANS Nov 21, 1933.

Filed May 6, 1935 P, re 0 mm m Tma H SINGLE ENDED NETWORK b zzaw k His Attorne Patented Nov. 21, 1933 v om'reo STATES PATENT cri ics COUPLING S Hans Roder, Schenectady, N. Y., assignor to General Electric Company, a corporation of New York 7 Application May 6, 1933. Serial No. 669,743

4 Claims. (Cl. 178 4 =4) My invention relates to circuit coupling means in greater detail coupling coils constructed in and more particularly to means for coupling a accordance with my invention. single ended circuit with a circuit of the double Referring to the drawing I have shown in Fig. ended, balanced, or push pull type. All of these 1 thereof a single ended electron discharge am- 5 types of ircuits will be referred to hereinas pllfiel 1 Coup d t a d ubl ended Pu h 191111.

double ended Circuits amplifier 2 through a transformer 3. The trans- When transformers are employed for coupling mer 3 Comprises a p of p y windings a single ended circuit with a double ended cir- 4 and 5 which a Wound in pp relation 0n cuit difficulties are likely to result, particularly a common axis av their adja t t minals t radio frequencies, due to inherent capacity connected together and to the cathode of disbetween the rimar and secondary windings. charge device 5 through a source f p n ial 9 The winding connected in the single ended circuit and bypass 001101611591 0- The DDOSitetG -iHaIS ordinarily is grounded at one end and the oppoof 00118 4 and 5 are Connected the n d of site and is at high alternatingpotentiaL The the discharge device. The transformer 3 also winding connected in the double ended circuit has a S ondary Windingfi which is. wound in the [0 is ordinarily grounded at the middle and its op- Seme direction throughout its length and the posite terminals are at high alternating potential. opposite terminals of which are connected to the Accordingly if the winding which is connected i of the dischal'gedevices 7 d The in the double ended circuit be positioned with P 1 this Winding a be connected t0 the p -t t ther to produce a naxi cathodes 0f the discharge devices 7 and 8, VOltage mtun of mutual inductance between the windsgm'ce 11 and bypass condenser ings considerable capacitive coupling will exist AS us arranged it will be Seen thatsthahfiuxes betw en the windings. This will be apparent for producedby the 90115 and 5 31min a i r813" example when it is considered that for maximum i in the @0115 and that'the Coil 6 may posimutual inductance one of the windings should be F relative to t Coil 5 for maximum-mutual 8Q situated about midway between the terminals mcluctamet W111 also lggsgen that. the of the other. Thus the points of zero alternating q of the C0116 andadmcent terminals of t I potential on the two coils will be widely, spaced c0115 4 Z of Whlch are at zeflro alternatmg apart and similarly other points or" the coils of illgfjtromotlve 3 are arranged m 9 about equal voltage will be widely spaced apart. to each other t y the capac-lty effect Thus considerable voltage exists between the prlmary W d and Secondary coils throughout their length th reby giving rise wlrtdmgs 1S reduced This capafclty efiest may be to objectionable capacitive effects. t g gfiy q g i 1 h e held, to mlmmlze these or Eli-eat? titan; ifiitfifiifiti 350$; t pacltlve efiects, the points of zero voltage on the 2 U 1 more in detail in Fig. 3 in which the 0011s 4 and two coils are placed in proximity to each othel, 5 are Shown Wound u 9 then maximum mutual inductance is not obpom 01m and the 9 tamed. geismsiilfgvnogiignd upori a fgrgn 14. hThe opposite One of the objects of my invention is to proa s C01 S f E i Own as mn- 4.0 vide an inductive coupling system for use nected together and as connected ho a common Oelead 15 while the adjacent terminals of these tween slngle ended and double ended circuits in 1 which these undesirable capacitive eilects, are wmdmgs are Connected to lead winding 6 is shown as having three leads extending greatly reduced and in which maximum mutual i 1 c-eto corlespondlng to those WhlC'l exten to inductance between the windings may be had. l d

the cathode and to -r'ds i th d h o i e The novel features which I believe to be char- 7 n 3 of Fig g 1 0 e 186 Mae devlces h acteristic of my invention are set forth with par- Fig. 2 shows a transformerconstyucted in ticularity in the appended claims. My invention, cordance with my invention connected to supply w v both as to its Organization and method oscillations from a double ended circuit comof operation together with further objects and prising discharge devices 17 d 13 t a single 105 advanta s th r f ay st b und rst by ended circuit. This single ended circuit is repreference to the following description taken in resented in t drawing by t rectangle 19 and connectio W h the p y g drawing in may comprise any suitable network such as an w c FigS- 1 and 2 represent different embodielectron discharge amplifier, filter, or tuning sysm nts f y v i a d i s- 3 and 4 w tem for an antenna 20. In this case the primary no winding 21 of the transformer is wound in the same direction throughout its length whereas the secondary windings 22 and 23 are wound in opposite directions, adjacent terminals thereof being connected to one side of the single ended circuit and opposite terminals being connected to the other side of the single ended circuit. The primary winding 21 in this figure is shown as connected in parallel with the tuned circuit comprising condensers 24 and 25 and a tuning reactance 26. This transformer is also shown by the arrow drawn therethrough as being of the variable coupler type.

A transformer of the construction indicated in Fig. 2 is shown in greater detail in Fig. 4 in which the primary winding 21 is wound upon a form 27 and the secondary windings 22 and 23 are shown as wound upon a form 28. Form 28 carrying the secondary windings is arranged to be rotatable about an axis common to the planes of the minimum potential turns of both the primary and secondary windings.

It will be seen in both Figs. 3 and i that the secondary windings of the transformer are narrow relatively to the width of the primary windings, that is, that they are concentrated about the zero voltage point thereby to produce a minimum capacity effect between the windings while at the same time securing a maximum of mutual inductance.

If desired, the capacity ei fect between the windings may be still further reduced by means of the grounded shield between the primary and secondary windings which is indicated in Fig. 2 by the dotted line 29.

While I have shovm particular embodiments of my invention it will be understood that I do not wish to be limited thereto since further modifications may be made. I therefore contemplate by the appended claims to cover any such modifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In a system for coupling a single ended circuit with a doubl ended circuit, comprising a transformer having a pair of primary windings anda pair of secondary windings, one pair of said windings being wound in opposite directions andconnected in parallel in said single ended circuit and the other pair of windings being wound in the same direction and connected in balanced relation in said double ended circuit, and the points of zero alternating potential on both pairs of windings being placed in close proximity to each other.

2. In combination, a single ended circuit having a winding connected between ground and a point or" hi h alternating potential, a double ended circuit having a winding disposed in inductive relation with said first winding, the opposite terminals of said winding being connected to opposite sides of said double ended circuit and an intermediate point on said winding being connected to ground, a third winding connected in parallel with said first winding and so wound as to cause the flux produced thereby to aid the flux produced by said first winding in said second winding, said first and third windings being so positioned with respect to said second winding that the points of ground potential on all of said windings are in close proximity and equal inductive coupling is produced between said single ended circuit and each side of said double ended circuit.

3. In a system for coupling a single ended circuit with a double ended circuit, comprising a 109 transformer having a pair of primary windings and a pair of secondary windings, one pair of said windings being wound in opposite directions and connected in parallel in said single ended circuit and the other pair of windings being wound in the same direction and connected in balanced relation in said double ended circuit, and the points of zero alternating potential on both pairs of windings being placed in close proximity to each other, and the windings of one of said pairs being relatively closely spaced about the zerovoltage point of said other pair.

4. In a system for coupling a single ended circult with a double ended circuit, comprising a transformer having a pair of primary windings and a pair of secondary windings, one pair of said windings being wound in opposite directions and connected in parallel in said single ended circuit and the other pair of windings being wound in the same direction and connected in balanced relation in said double ended circuit, said pairs of windings being so spaced relative to each other as to produce a maximum of mutual inductance between the pairs of windings and a minimum of capacity between said pairs of windings.

HANS RODER.

DESCLAEMER 1,936,438.Hans Rotter, Schenectady, N. Y. COUPLING MEANS. Patent dated November 21, 1938. Disclaimer filed November 30, 1934, by the assignee, General Electric Company.

Hereby enters the following disclaimer to claims 1 and 4 of the said Letters Patent, which are in the following words, to wit:

1. In a system for coupling a single ended circuit with a double ended circuit, comprising a transformer having a pair of primary windings and a pair of secondary windings, one pair of said windings being wound in opposite directions and connected in parallel in said single ended circuit and the other pair of windings being wound in the same direction and connected in balanced relation in said double ended circuit, and the points of zero alternating potential on both pairs of windings being placed in close proximity to each other? 4. In a system for coupling a single ended circuit with a double ended circuit, comprising a transformer having a pair of primary windings and a pair of secondary windings, one pair of said windings being wound in opposite directions and connected in parallel in said single ended circuit and the other pair of windings being wound in the same direction and connected in balanced relation in said double ended circuit, said pair of windings being so spaced relative to each other as to produce a maximum of mutual inductance between the pairs of windings and a minimum of capacity between said pairs of windings.

[Oficial Gazette January 1, 1935.] 

